South Korea’s semiconductor exports to China plunged last month, deepening concerns about a cooling in global demand already threatened by US tariffs, as Washington steps up its restrictions on technology supplies to Beijing.Chip sales to the world’s second-largest economy including Hong Kong fell 31.8% from a year earlier, according to South Korea’s Trade Ministry. That’s bigger than the 22.5% contraction reported for January and comes after a 2024 rally that helped fuel South Korea’s economic ...